JPH08118371A - Lead screw, molding thereof and method and mold for integral molding with rotor - Google Patents

Abstract

PURPOSE: To save the labor in integral molding and to inexpensively produce a product excellent in accuracy, in a lead screw molding method of injecting a resin material into a metal pipe, by injecting the resin material into the pipe from the outer peripheral parts of the predetermined hole parts provided to the pipe. CONSTITUTION: After the upper end part of a pipe 2 is positioned, a resin material is injected into the pipe 2 through the gate positioned at the upper end opening part of the cavity provided to the outer peripheral part of the pipe 2 to be allowed to flow in the direction of a cavity a1 . Subsequently, the resin material is allowed to continuously flow in the spriral groove 4a of the cavity a1 and further filled into the empty core part 10 of the pipe 2 from the hole parts 5 provided to the wall part 3 of the pipe 2. Whereupon, the resin material of the empty core part 10, the screw thread part 4 mounted on the outer peripheral part of the pipe 2 and the resin material of the cover part on the other side of the pipe 2 having no screw thread part 4 are connected in a mutually sewn state and a lead screw having the pipe made of a metal arranged therein and having the screw thread part 4 formed thereto can be produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead screw, a method for integrally molding a lead screw and a rotor, and a molding die for the same. More specifically, the invention relates to a drive motor shaft used for a head positioning mechanism in a floppy disk mechanism. The present invention relates to a lead screw that is connected and converts its rotational movement into a linear movement of a carriage, a lead screw that is integrated with a rotor, and other lightweight and molding methods for insulating shafts and molding dies used in various electrical equipment. is there.

[0002]

2. Description of the Related Art As a conventional lead screw, a metal rod made of metal such as gun metal or stainless steel and having a desired thread formed thereon has been used. However, although these have high dimensional accuracy, the processing method is complicated, the manufacturing cost is high, the productivity is low, and it is difficult to provide them at low cost. So, synthetic resin material. Various proposals have been made to obtain lead screws by molding, but the following drawbacks are unavoidable. That is,
Synthetic resin is easy to mold, but it may cause shrinkage and cracks, which are the drawbacks of resin, and may deform such as bending over time due to environmental changes. The use of is unreliable. In view of the above, there is a proposal of a lead screw in which a desired thread is molded and covered with a synthetic resin material on the wall portion of the metal pipe. However, the lead screw according to the proposal has a structure in which the metal pipe and the thread are integrated. Since it was insufficient, the pipe and the thread were separated, and the function as a lead screw could not be fulfilled, so it was not popularized. Therefore, a pipe having a plurality of holes penetrating at a desired interval is formed in a wall portion of a metal pipe at a position corresponding to a screw thread portion of a predetermined screw, and the row of holes provided in the pipe is formed. A metal mold is formed by engraving a screw groove having a screw thread portion that fits in, and the hole row provided in the pipe and the screw groove are matched with each other in the capacity to position the metal pipe, The inventor of the present application has proposed a method for molding a lead screw in which a resin material is injected from the axial direction of the metal pipe. (JP-A-2-113910)

[0003]

However, it has been found that there is a problem in the technique of the injection gate of the resin material in the method of manufacturing the lead screw according to the above publication. That is, the technique of "injecting a synthetic resin material from the axial direction of the metal pipe" described in JP-A-2-113910 has a problem that cannot be dealt with when it is difficult to inject the material from the axial direction of the metal pipe. It was Next, the molding of the rotor and the molding of the lead screw have conventionally been performed in separate steps. There has been a long-awaited technology for integrally manufacturing a robust lead screw and a rotor without damaging the rotor so as to save labor. In view of the above, it is an object of the invention of the present application to provide a product with excellent accuracy at low cost by further saving the labor-saving manufacturing method of the lead screw and the integral molding of the rotor and the lead screw.

[0004]

In order to achieve the above object, in the method of molding a lead screw of the present invention, a wall portion of an appropriate metal pipe or the like corresponds to a thread portion of a predetermined screw. A metal or the like pipe having a plurality of holes penetrating at desired intervals is formed at a position along the spiral, and a screw thread portion suitable for a hole row provided along the screw thread portion of the metal or the like pipe is provided. Forming a die having a screw groove engraved therein, and aligning the hole row and the screw groove with each other in the capacity of the die to position the pipe of metal or the like, and the wall of the pipe of metal or the like. This is to combine the technique of arranging the gate on the outside of the hole penetrating the body and injecting the resin material from the outside of the predetermined hole row. Furthermore, in the method of integrally molding the lead screw and the rotor of the present invention, an appropriate rotor is fitted to one end of the pipe formed according to the method of molding the lead screw, and the outer peripheral portion of the rotor is fitted. And an upper mold having a plurality of sector-shaped caps b ₁ having a fan-shaped cross section defined by radial holding pieces, and a thread portion adapted to a row of holes penetrating the wall portion on the other side of the pipe. Forming a lower mold provided with a capital b ₂ having a spiral groove formed therein, and when the molds are matched, the capacities b ₁ and b ₂ are communicated with each other, and the rotor side is fitted into the capacity b ₁ . , The other side is inserted into the capacity b ₂ to be positioned, and by combining the technique of injecting the resin material through the gate arranged on the end face portion of the capacity b ₁ , the lead screw and the rotor are combined. It is to reduce the labor of integral molding, prevent damage to the rotor during molding, and provide highly reliable products.

[0005]

According to the method of molding a lead screw of the present invention, the lead screw has a plurality of holes at desired intervals at a position corresponding to a thread portion of a predetermined screw in a wall portion of a pipe made of metal or the like. The pipe having the part penetrated is positioned in the capacity of a mold having a thread groove provided with a thread portion adapted to the row of holes provided in the pipe, and the pipe is penetrated into the pipe. Since the resin material is injected through the gate arranged on the outer periphery of the predetermined hole, the injected resin material is injected along the screw groove portion of the capacity that penetrates the hole, and at that time. , The air core portion of the pipe is also filled through a hole portion penetrating at a position corresponding to the screw groove portion, and the thread portion formed on the pipe peripheral wall portion is provided with the hole portion provided on the pipe wall. Will also be filled in, and the thread portion and the pipe air core And Hama material is connected to the sewn to each other, threaded portion is integrally molded with the pipe. next,
In the integral molding of the rotor and the pipe, the step of mounting the rotor on one end of the pipe formed according to the above-mentioned lead screw pipe, and the outer peripheral portion of the rotor are divided by radial clamping pieces. the Kyapiti b ₁ of a plurality of cross-sectional sector, which is provided, thereby forming an upper mold which is adapted to embrace the rotor, screw fits in the hole rows formed in the wall portion of the other side of the pipe Forming a lower mold provided with a capital b _{2 in} which a spiral groove having a mountain portion is engraved, and allowing the capacities b ₂ and b ₁ to communicate with each other;
By inserting the one side of the pipe that Sohama rotor into the Kyapiti b _1, the rotor is held by the edge portion of the radial clamping piece of Kyapiti b _1, the posture of the rotor is properly regulated . (That is, the pipe is positioned at both ends, but the narrow gap between the outer peripheral wall of the pipe and the inner wall of the rotor is properly regulated, and the centering is accurately performed.) Next, the pipe is inserted into the capacity b ₂ . On the other side of the fitted pipe, after the row of holes of the pipe and the screw groove of the capacity b ₂ are fitted and positioned, the resin material is inserted through the gate arranged on the end face of the capacity b _1. Is injected. Therefore, the resin material first flows into the capacity b ₁ holding the rotor, and then the capacity b ₁ .
₁ flows into the capacity b ₂ communicating with ₁ . Therefore, after the outer peripheral surface of the rotor is covered with the resin material, the resin material is injected into the narrow gap between the pipe and the rotor, and the empty space of the pipe is passed through the row of holes provided in the pipe. The core is also filled. As described above, the inflowing resin material covers the rotor with the material flowing into the capacity b ₁ surrounding the rotor, so that the magnetic body is damaged by the internal pressure of the material flowing inside the magnetic body of the rotor. There is no danger of receiving.

[0006]

Embodiment 1 A preferred embodiment of the present invention will be described with reference to the drawings. 1 to 6, the method for molding the lead screw (1) according to the present invention is obtained by spirally winding a pipe (2) such as stainless steel or a strip-shaped stainless thin plate or another thin plate of an appropriate material and subjecting it to a stretching process. Or a tube made of natural fiber, synthetic fiber, ceramics, etc., and a thread (4), (4) having a predetermined pitch on the wall (3) of the required length section. Along the helix at every desired interval (for example, 1 to 4 per revolution of the thread).
Individual) a step of providing hole portions (5), (5) a by penetrating hole portions (5), (5) for inflowing a resin material, and the hole portion rows (5) a, (5) A thread groove (4) having thread portions (4), (4) adapted to the hole row (5) a, (5) a in a length section corresponding to a predetermined length section of a. a, (4) A lower mold (6) having a capacity (a) ₁ engraved with a is formed, and in the direction of the opposite end of the pipe (2) (upward in the figure), the pipe ( In the outer peripheral portion of 2), an upper die (7) provided with a capty (a) ₂ having a recessed portion having the height of the screw threads (4) and (4) is formed, and the upper die (7) is formed. When the mold (7) and the lower mold (6) are matched with each other, the capacity (a) ₁ and the capacity (a) ₂ are formed so as to communicate with each other, and the lower mold (6) Kyapiti of) _(a) within ₁ Was fitted to one side of the pipe (2), the pipe pierced the hole column wall portion (3) of (2) (5) a,
(5) a and the screw groove (4) a, (4) a of the capacity (a) ₁ of the lower mold (6) are fitted to each other, and the pipe (2)
At the lower end of the pipe, it is positioned through a positioning pin (8) or an appropriate ejector, and the pipe (2)
The other side of the upper mold (7) of the capacity (a) ₂
The upper end of the above-mentioned capacity (a) ₂ provided on the outer peripheral portion of the pipe (2) after being inserted into the pipe (2) and positioned at the upper end of the pipe (2) through the upper positioning pin (8) a. through a gate disposed in the opening (9), the resin material is injected, the infusion material from Kyapiti (a) _2, Kyapiti (a) is allowed to flow in _one direction, the Kyapiti (a) ₁ of screw groove ( 4) a, (4) a while continuously flowing into the,
A hole (5) penetrating the wall (3) of the pipe (2),
According to (5), by filling the air core portion (10) of the pipe (2) with the resin material, the resin material of the air core portion (10) and the outer peripheral portion of the pipe (2) are mounted. A resin material in which the thread portions (4), (4) and the resin material of the covering portion on the other side of the pipe (2) that does not form the thread portion and the hole portions (5), (5) are filled. To connect them to each other in a sutured state.

Instead of injecting the resin material through the gate (9) arranged at the upper end of the capacity (a) ₂ , as another embodiment, the lower mold (6) and the upper mold ( 7) and a material injection port (11) is provided along the PL surface with the hole (5) penetrating the wall (3) of the pipe (2).
The runner (11) a communicating with the side surface of the capacity (a) ₂ that is linked to the outer periphery of the runner is provided, and the resin material is injected through the gate (12) arranged at the tip of the runner. You can also In addition, the upper mold (7) is formed into a split mold, an appropriate angular pin is attached, and a proper driving mechanism (13) is arranged in the lower mold (6).
It is also possible to screw the ejector connected to 3) to remove the mold of the lead screw (1) on which the ridges (4) and (4) are formed, with labor saving. (However, illustration is omitted.)

Therefore, the hole diameters of the hole portions (5), (5) formed in the wall portion of the pipe (2) are somewhat different depending on the viscosity of the resin material used for molding, the injection pressure, the mold temperature, etc. Usually, it is desirable that the diameter is about 1/10 to 2/10 of the pipe diameter. The stainless steel pipe or the strip-shaped stainless steel thin plate used in the present invention is spirally wound, and the tubular body obtained by subjecting it to stretching is screwed through an appropriate rotating mechanism, and the tubular body is screwed at a predetermined pitch. The rolling can be stopped, and during the screwing stop time, a suitable light shielding device can be opened and closed to perforate with a laser beam or the like to penetrate a desired row of holes. However, without screwing the pipe, the hole rows (5) a, (5) a are provided at a predetermined pitch while sliding, and the pipe is rotated by a predetermined angle to obtain a predetermined screw. Yamabe (4),
A spiral row of holes (5) a conforming to (4),
(5) It is also possible to provide a. In the above, by using a pipe obtained by using appropriate materials alone or in combination, the thickness of the pipe body is increased or decreased to further reduce the weight, or the screw thread portions (4), (4) are used. The outer peripheral surface of the pipe (2) between the lower edge portions is covered with a resin material so that the lower edge portions of the screw thread portions (4) and (4) are connected to each other, so that the electrical insulation effect is improved. It is possible to improve the lead screw, reduce the generation of noise, and obtain a lead screw excellent in accuracy and strength. (However, shown in 5)

[0009]

[Embodiment 2] Referring to FIGS. 7 to 12, a method of integrally molding a lead screw and a rotor according to the present invention is such that a thread portion (4), ( At a position corresponding to 4), a pipe (2) obtained by penetrating a plurality of holes (5), (5) at desired intervals is provided at one end of the pipe (2) with a return body (14) made of aluminum or the like. )
Ring-shaped magnetic bodies (16), (16) with rotation-stopping claws (15) protrudingly provided on the inner wall so as to sandwich them on both sides of the
The step of fitting the rotor (17) in which the rotors (17) are arranged and combined, and the rotor (1) is attached to the outer peripheral portion of the rotor (17).
7) to hold the radial clamping pieces (18), (1
8) A mold (19) having a plurality of sector-shaped caps (b) ₁ divided by (Figs. 10 to 11) is formed, and a predetermined part is provided on the other side of the pipe (2). Capability (b) ₂ having thread grooves (4) a, (4) a provided with thread portions (4), (4) adapted to the hole row (5) a, (5) a of the section When a lower mold (20) having the above is formed and the lower mold (20) and the upper mold (19) are matched with each other, the capacity (b) ₂ and the capacity (b) ₁ are separated from each other. formed so as to communicate with each other, Kyapiti (b) ₁ to the said upper mold (19), the rotor (1
7) The pipe (2) fitted with one side is inserted and at the same time, the other side of the pipe (2) is inserted into the capacity (b) ₂ .
A row of holes (5) a, (5) a provided in the pipe (2),
When the screw grooves (4) a, (4) a of the capacity (b) ₂ are fitted to each other and matched with each other, the other end of the pipe (2) has a positioning pin (8) or an ejector. The rotor (17) on one side of the pipe (2) is positioned by the radial holding pieces (18) and (18) of the capacity (b) _{1 so that} the rotor (1) is positioned.
The peripheral part of 7) is gripped, and the upper end of the pipe (2) is
The capacity (b) is positioned via the positioning pin (8) a and is further positioned via the gate (21) disposed on the end face of the capacity (b) ₁ having the rotor (17) built therein.
The resin material is injected into the _1, wherein Kyapiti (b) a resin material injected into the _1, said Kyapiti (b) ₁ and communication with Kyapiti (b) ₂ of the pipe (2) threaded on the outer peripheral portion groove (4 )
a, (4) a, and the screw groove (4) a,
(4) Hole row (5) a, (5) arranged in conformity with a
The air core portion (10) of the pipe (2) is also filled via a. Therefore, by the same reason, one side of the pipe (2) fitted with the rotor (17) has one side of the capacity (b).
₁ of the resin material was implantation than the end face, the injection at the start from the end face of the Kyapiti (b) ₁ part, clamping piece (18),
The resin material is injected into each of the recesses defined by (18) and the outer peripheral portion of the rotor (17) is filled with injected resin. The gap between the pipe (2) and the rotor (17) is filled, and the pipe (2) on one side is also filled.
The air core portion (10) of the pipe (2) is also filled through the row of holes (5) a, (5) a penetrating the wall. That is, the rotor (17) holds the rotor (17) by injecting a resin material before the annular magnetic bodies (16) of the rotor (17) are filled with the resin material on the inner wall portions of the rotor. Since it is held by the filling material of the capacity (b) _{1 in} the posture, the annular magnetic bodies (16), (16) generated by the internal pressure of the resin material filled in the gap between the pipe (2) and the rotor (17). ) Damage can be prevented.

[0010] The above, in the configuration of the gate of Kyapiti _{(b) 1} part, Kyapiti _{(b) 1} of the end surface portion to the gate (2
Instead of arranging 1), as another embodiment, the connection between the capital (b) ₁ and the pipe (2) along the PL surface of the lower mold (20) and the upper mold (19). A gate (2) provided with a runner (11) communicating with the rear end face of the neck capacity (b) ₁ and arranged at the opening of the runner (11)
It is also possible to inject a resin material via 0).

In the above structure of the capacity (b) ₁ , the hole row (5) a, which is provided on the other side of the pipe (2),
(5) A screw thread (4) conforming to (a), a screw groove (4) a having the thread (4), and a capty (b) ₂ engraved with (4) a are provided, and the thread thread (4) is provided. , (4), a part of the outer peripheral portion of the pipe (2) may be exposed, and another embodiment may be implemented as the following structure. That is, a resin material is provided so as to cover the outer peripheral surface of the pipe (2) in the gap between the lower edges of the screw threads (4) and (4) without exposing the outer peripheral surface of the pipe (2). Space for injection (2
5), forming a lower mold (6) a provided with a capacity (b) ₂ having a screw groove (4) b engraved with (25), and forming the lower mold (6) a and the upper mold. By matching the mold (7) with the mold and injecting the resin material according to the above, the rotor (1) is exposed without exposing the outer peripheral surface of the pipe (2).
It is possible to perform integral molding of the lead screw fitted with 7).

The mold in the above-described embodiment is configured to position and mold the molding object in the direction of molding, but if necessary, position the molding object in the lateral direction. Needless to say, the molding can be performed and a plurality of capacities can be mounted side by side. (However, illustration is omitted.)

Next, the molding die of the present invention is shown in FIGS.
In the lower mold (2) on the fixed side of the mold device (23)
0) and the upper mold (19) on the movable side.
4), (24) a, which is equipped with a runner including a gate (21), is connected to a mold temperature control mechanism, a drive mechanism (13), etc., and is a lower mold (20) and an upper mold. (19) and are adapted to operate in cooperation with each other.

[0014]

Since the present invention has the above construction, it has the following effects. (A) In the lead screw according to the present invention, a tubular body made of metal or the like is used as a core material, and a screw thread portion made of a resin material is mounted on the outer peripheral portion thereof, and the screw thread portion is
By the resin material filled in the air core of the metal or the like pipe and the resin material filled in the row of holes penetrating the pipe wall,
Since they are connected in a sutured state via the pipe wall, the thread portion is connected to the pipe outer peripheral portion without being separated. Therefore, it is excellent in bending and tensile stress, is lighter in weight, and is superior in slidability and electrical insulation compared with a processed product such as a metal rod processed by lathing. Further, in the method of forming the thread portion, when it is difficult to inject the resin material through the air-core opening portion of the shaft end portion of the air-core pipe, the material is injected to fill the air-core portion and the outer peripheral portion of the pipe. be able to. (B) The screw thread portion is filled with the resin material under a substantially uniform inner pressure along the screw groove of the die, and the pipe empty space is provided through the row of hole portions of the pipe wall that fit the screw groove. Since they are integrally connected by the resin material with which the core is filled, the accuracy of the pitch of the threaded portion and the pitch is high, and the accuracy of movement direction conversion is high and the reliability is excellent. (C) Next, in the lead screw mounted with the molding method and the rotor according to claim 2, the resin material is covered in the gap between the lower edges of the threaded portions mounted on the outer periphery of the pipe, Since the outer peripheral portion is not exposed, the effects of rust prevention and electrical insulation are improved, noise is prevented, and the accuracy of screw threads is maintained. (D) Further, the method for integrally molding the rotor and the lead screw and the die according to claims 3 to 6 are such that after the outer peripheral portion of the ring-shaped magnetic body constituting the rotor is filled with a resin material,
Since the material flows into the gap of the inner wall of the magnetic body, it prevents damage to the magnetic body during molding, and because the rotor and pipe are integrally molded, it is extremely labor-saving and has little post-work and is highly productive. It has various industrial effects such as low cost.

[Brief description of drawings]

FIG. 1 is a front view of a lead screw according to the present invention.

[Fig. 2] Same as the right end view

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a partially cutaway enlarged sectional view of FIG.

5 is a partially cutaway enlarged sectional view showing another embodiment of FIG.

FIG. 6 is an explanatory sectional view of the main part of the molding die device.

FIG. 7 is a front view of the same with a rotor mounted on one side of the lead screw.

FIG. 8 is a right end view of FIG.

9 is a sectional view taken along line BB of FIG.

FIG. 10 is a partially cutaway cross-sectional explanatory view of the capity arranged on the outer peripheral portion of the rotor fitted to the lead screw.

FIG. 11 is a sectional view taken along the line CC of FIG.

FIG. 12 is an explanatory cross-sectional view of a main part of the mold device for integrally molding the lead screw and the rotor.

[Explanation of symbols]

1: Lead screw 2: Pipe 3: Wall body part 4, 4: Screw thread part 4a, 4a: Screw groove 5,5: Hole part 5a, 5a: Hole part row 6: Lower mold 7: Upper mold 8: Positioning pin 8a: Positioning pin 9: Gate 10: Air core part 11: Inlet port 11a: Runner 12: Gate 13: Drive mechanism 14: Aluminum ring body 15: Rotation stop claw portion 16, 16: Axial magnetic body 17: Rotor 18, 18: Clamping piece 19: Upper mold 20: Lower mold 21: Gate 22: Gate b ₁ : Capity b ₂ : Capity 23: Mold device 24: Template 24a: Template

Claims (6)

[Claims] 1. A step of penetrating a plurality of holes at a desired interval at a position corresponding to a thread portion of a predetermined screw on a wall portion of a metal pipe, etc. A metal mold is formed by forming a die in which a screw groove having a thread portion suitable for the hole row is engraved, and the hole row provided on the metal pipe and the screw groove are fitted to each other in the capacity. In a method of molding a lead screw in which a pipe is positioned and a resin material is injected into the metal pipe, the resin material is injected from the outer periphery of a predetermined hole penetrating the metal pipe. Molding method for lead screw. 2. A capity in which a screw groove is formed in a gap between mutual lower edges of screw threads that fit into a row of holes, and a groove for forming a resin material is formed so as to cover the outer peripheral surface of the pipe in the gap. The method for molding a lead screw according to claim 1, wherein a die including the above is coupled. 3. A plurality of holes are formed in a wall portion of a pipe made of metal or the like at a position corresponding to a thread portion of a predetermined screw at desired intervals and one end portion of the pipe is provided. A step of fitting an appropriate rotor, and a plurality of fan-shaped cross-section-shaped caps b ₁ divided by radial sandwiching pieces are provided on an outer peripheral portion of the rotor, and the rotor is formed so as to hold the rotor, and the pipe is formed. B ₂ having a thread groove provided with a thread portion adapted to the row of holes provided in the other side wall body of
To form a mold in which the capacity b ₂ and the capacity b ₁ are communicated with each other, and one side of a pipe fitted with a rotor is inserted into the capacity b _{1 and the} inside of the capacity b ₂ is inserted. on the other side of the pipe, and the hole rows of the pipe, after having inserted by fitting together the screw groove of Kyapiti b _2, the Kyapiti b ₁ of arranged end face gate and or of the Kyapiti b ₁ A method for integrally molding a lead screw and a rotor, characterized in that a resin material is injected through a gate that is arranged so as to communicate with the outer peripheral portion of the neck portion connecting the rear end rotor and the pipe. 4. A capty in which a screw groove is engraved in a gap between the lower edges of the threaded portions that fits the row of holes, and a space for injecting a resin material that covers the outer peripheral surface of the pipe in the gap is formed. The method for integrally molding a lead screw and a rotor according to claim 3, wherein a lower mold including the above is joined. 5. A wall portion of a metal pipe is provided with a plurality of rows of holes at desired intervals at positions corresponding to the screw thread portions of a predetermined screw, and an appropriate row is provided on one side of the pipe. A rotor is fitted, and a plurality of sector-shaped fan-shaped caps b ₁ are provided on the outer peripheral portion of the rotor, which are divided by radial holding pieces arranged so as to embrace the rotor, and the other side of the pipe is also provided. the Kyapiti b ₂ was engraved spiral groove comprising a matching threaded portion on the hole rows formed in the provided form the Kyapiti b ₂ and the Kyapiti b ₁ and a die communicating with each other, the Kyapiti b _One side of the pipe fitted with the rotor is inserted into the inside of ₁ , and the other side of the pipe is inserted into the inside of the capacity b ₂ , and the hole part row of the pipe on the other side and the above-mentioned screw groove are inserted. Aligned with each other and positioned, one side of the pipe An integrated lead screw and rotor characterized in that a resin material is injected through a gate arranged in communication with an end edge portion of the capacity b ₁ and / or an outer peripheral portion of a connecting neck portion between the rotor and the pipe. Mold for molding. 6. A capty in which a screw groove having a resin material injection space for enclosing the outer peripheral surface of the pipe of the gap is formed in the gap between the lower edges of the screw threads that fit the row of holes. A mold for integral molding of a lead screw and a rotor according to claim 5, wherein a lower mold including the above is joined.